Translocation power point for wra website
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Transcript of Translocation power point for wra website
Translocation of California Red-legged Frog (Rana draytonii) to Restored Critical Habitat, Solano County.
Rob Schell, WRA, Inc.
[email protected], (415) 454-8868
California Red-legged Frog (CRLF)
Federally listed as Threatened in 1996
CDFW Species of Special Concern (SSC)
Final Critical Habitat designated in 2010
Recovery Plan Published in 2002
Consistent with Recovery Plan actions and tasks
Conservation Banking
The goal of conservation banking is to protect, manage and enhance/create habitat for ESA listed species. The program Incentivizes conservation and management of large tracts private lands to benefit listed species. Once a bank is developed, the bank owner can sell endangered species habitat “credits” to mitigate for other project impacts. To ensure bank success, the owner must establish a non-wasting endowment for perpetual management of the preserve which funds scientific based monitoring.
Ridge Top Ranch Conservation Bank • 745 acres located in
southwestern Solano County
• 12 existing stock ponds
• Surrounded by privately owned Rangeland or preserved lands
• Within Designated Critical
Habitat for CRLF
Historic Anuran Translocations
• California Red-legged Frog • GGNRA/USGS • Pinnacles National Monument
• Oregon Spotted Frog (Rana pretiosa) • Relict Leopard Frog (Rana onca) • Northern Leopard Frog
(Rana pipiens)
Pre-translocation Due Diligence at the Conservation Bank Site
Visual surveys for CRLF in Q1-2 2010
Surveys were negative
Follow-up seining for CRLF in Q2 2010
Surveys were negative
Toxicology sampling and analysis in Q3 2010
Analytics were negative for contaminants
Analysis of chytrid fungus at donor location and at Ridge Top Ranch
Chytrid is present at both sites
Ridge Top Ranch Conservation Bank
Pond D
Pond N
Pond B
Pond E
• Ponds N and D were fenced and planted in Q4 2010 • Bullrush • Spikerush • Arroyo willow
• Ponds B and E were fenced
and seeded in Q4 2012 • Bullrush • Spikerush
Pilot Pond Restoration: Before and After Pond N Pond D
Befo
re
Oct.
2010
Aft
er
Ma
rch
2012
2012 Donor Site Surveys
Donor larvae
2012: Year 1 Translocation
Collected eggmass along with attachment material. Placed in large plastic bags similar to taking home a fish from a pet store.
Transported eggs in temperature-controlled coolers
Eggs placed in hatch-out cages to “head-start” larvae and protect against invertebrate predators.
CRLF Embryotic/Larval Development
~2CM TL 9 days old: Confirmed embryo viability and development
22 days old: Larvae began to hatch
41 days old
CRLF Larval/Juvenile Development - Continued
~11cm TL
• First metamorph observed at 138 days old
• Population monitoring began Q3 2012 – will continue until 2016
• All individuals captured over 40mm SUL, were PIT tagged to track dispersal, colonization, and demographics
108 days old
237 days old: ~5cm SUL
2012 Preliminary Results Number of Metamorph
California Red-legged Frogs
YOY Visually Detected 104
YOY PIT Tagged 76
Males Tagged 30
Females Tagged 16
Unknown Sex Tagged 30
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
75.0
80.0
0.0 10.0 20.0 30.0 40.0 50.0
SUL
(mm
)
Weight (grams)
2012 YOY R. draytonii Preliminary Demographic Data
Male n=30
Femalen=16
Unknownsex n=30
55 mm is the threshold size at which CRLF can be reliably sexed.
Thank You! • Land Bank • Dave Kelly (USFWS) • Dr. Brad Shaffer (UCLA) • WRA Staff
• Geoff Smick • Tricia Valcarcel • Dan Chase
Rob Schell, WRA, Inc. [email protected]
(415) 454-8868 x 149